<?php
declare(strict_types=1);

function twilio_request(string $sid, string $token, string $url, string $method = 'GET', array $data = []): array {
    $ch = curl_init();
    $opts = [
        CURLOPT_URL => $url,
        CURLOPT_RETURNTRANSFER => true,
        CURLOPT_TIMEOUT => 20,
        CURLOPT_USERPWD => $sid . ':' . $token,
        CURLOPT_HTTPAUTH => CURLAUTH_BASIC,
        CURLOPT_CUSTOMREQUEST => strtoupper($method),
    ];
    if (strtoupper($method) === 'POST') {
        $opts[CURLOPT_POSTFIELDS] = http_build_query($data);
    }
    curl_setopt_array($ch, $opts);
    $resp = curl_exec($ch);
    $code = curl_getinfo($ch, CURLINFO_HTTP_CODE);
    $error = curl_error($ch);
    curl_close($ch);

    if ($resp === false || $code < 200 || $code >= 300) {
        return [
            'success' => false,
            'status' => $code,
            'error' => $error ?: $resp,
        ];
    }

    $decoded = json_decode($resp, true);
    return [
        'success' => true,
        'status' => $code,
        'data' => $decoded ?: $resp,
    ];
}

function twilio_send_sms(array $twilio, string $to, string $body): array {
    $url = 'https://api.twilio.com/2010-04-01/Accounts/' . urlencode($twilio['account_sid']) . '/Messages.json';
    return twilio_request(
        $twilio['account_sid'],
        $twilio['auth_token'],
        $url,
        'POST',
        [
            'From' => $twilio['from_number'],
            'To' => $to,
            'Body' => $body,
        ]
    );
}

function twilio_fetch_sms_usage(array $twilio, string $startDate, string $endDate): array {
    $url = 'https://api.twilio.com/2010-04-01/Accounts/' . urlencode($twilio['account_sid'])
        . '/Usage/Records/Monthly.json?Category=sms&StartDate=' . urlencode($startDate) . '&EndDate=' . urlencode($endDate);
    return twilio_request($twilio['account_sid'], $twilio['auth_token'], $url);
}